package exercise.classinfo;

import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.Scanner;

public class ReflectionTest {
    public static void main(String[] args) {
        //获取输入的类名
        String name;
        if (args.length>0) name=args[0];
        else {
            Scanner in = new Scanner(System.in);
            System.out.println("输入类似这样的类名（e.g. java.util.Date）");
            name = in.next();
        }

        try {
           Class cl = Class.forName(name);
           Class supercl = cl.getSuperclass();
           String modifiers = Modifier.toString(cl.getModifiers());
           if (modifiers.length()>0){
               System.out.println("extends "+supercl.getName());
           }
           System.out.println("\n{\n");
           printConstructors(cl);
           System.out.println();
           printMethods(cl);
           printFields(cl);
        }catch (ClassNotFoundException e){
            e.printStackTrace();
        }
        System.exit(0);
    }

    public static void printFields(Class cl) {
        Field[] fields = cl.getDeclaredFields();
        for (Field f:fields) {
            Class type = f.getType();
            String name = f.getName();
            System.out.print("  ");
            String modifiers = Modifier.toString(f.getModifiers());
            if (modifiers.length()>0){
                System.out.print(modifiers+"  ");
            }
            System.out.println(type.getName()+""+name+"(");
        }
    }

    public static void printMethods(Class cl) {
        Method[] methods = cl.getDeclaredMethods();
        for (Method m:methods) {
            Class retType = m.getReturnType();
            String name = m.getName();
            System.out.print("  ");
            String modifiers = Modifier.toString(m.getModifiers());
            if (modifiers.length()>0){
                System.out.print(modifiers+" ");
            }
            System.out.print(retType.getName()+" "+name+"(");
            //类型
            Class[] paramTypes = m.getParameterTypes();
            for (int j =0;j<paramTypes.length;j++){
                if (j>0){
                    System.out.print(", ");
                }
                System.out.print(paramTypes[j].getName());
            }
            System.out.println(");");
        }
    }

    public static void printConstructors(Class cl) {
        Constructor[] constructors = cl.getConstructors();
        for (Constructor c:constructors) {
            String name = c.getName();
            System.out.print("  ");
            String modifiers = Modifier.toString(c.getModifiers());
            if (modifiers.length()>0){
                System.out.print(modifiers+" ");
            }
            System.out.print(name+"(");

            Class[] paramTypes = c.getParameterTypes();
            for (int j =0;j<paramTypes.length;j++){
                if (j>0){
                    System.out.print(", ");
                }
                System.out.print(paramTypes[j].getName());
            }
            System.out.println(");");
        }
    }


}
